CN101319266A - Core-spun yarn for external refining desulfurization and removing fine foreign matter and preparation method thereof - Google Patents
Core-spun yarn for external refining desulfurization and removing fine foreign matter and preparation method thereof Download PDFInfo
- Publication number
- CN101319266A CN101319266A CNA2008100123805A CN200810012380A CN101319266A CN 101319266 A CN101319266 A CN 101319266A CN A2008100123805 A CNA2008100123805 A CN A2008100123805A CN 200810012380 A CN200810012380 A CN 200810012380A CN 101319266 A CN101319266 A CN 101319266A
- Authority
- CN
- China
- Prior art keywords
- cored
- wire
- core
- mixture
- steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000007670 refining Methods 0.000 title claims abstract description 18
- 238000002360 preparation method Methods 0.000 title claims abstract description 7
- 238000006477 desulfuration reaction Methods 0.000 title abstract description 12
- 230000023556 desulfurization Effects 0.000 title abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 65
- 239000010959 steel Substances 0.000 claims abstract description 65
- 239000000203 mixture Substances 0.000 claims abstract description 45
- 239000000292 calcium oxide Substances 0.000 claims abstract description 38
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 38
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000002893 slag Substances 0.000 claims abstract description 32
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000000843 powder Substances 0.000 claims abstract description 30
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims abstract description 29
- 239000001095 magnesium carbonate Substances 0.000 claims abstract description 29
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims abstract description 29
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 23
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 15
- 229910001634 calcium fluoride Inorganic materials 0.000 claims abstract description 15
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000011230 binding agent Substances 0.000 claims abstract description 9
- 238000002844 melting Methods 0.000 claims description 28
- 230000008018 melting Effects 0.000 claims description 28
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 27
- 229960001708 magnesium carbonate Drugs 0.000 claims description 27
- 235000012204 lemonade/lime carbonate Nutrition 0.000 claims description 26
- 238000009472 formulation Methods 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 15
- 238000001035 drying Methods 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 11
- 239000002994 raw material Substances 0.000 claims description 10
- 229910004261 CaF 2 Inorganic materials 0.000 claims description 8
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 8
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 8
- 239000010962 carbon steel Substances 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 239000004927 clay Substances 0.000 claims description 4
- 235000019353 potassium silicate Nutrition 0.000 claims description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 3
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 3
- 235000021050 feed intake Nutrition 0.000 claims description 2
- 238000003672 processing method Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 17
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 8
- 238000003723 Smelting Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 229910052717 sulfur Inorganic materials 0.000 abstract description 4
- 239000011593 sulfur Substances 0.000 abstract description 4
- 229910001209 Low-carbon steel Inorganic materials 0.000 abstract description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 abstract 4
- 229910000019 calcium carbonate Inorganic materials 0.000 abstract 2
- 229910000742 Microalloyed steel Inorganic materials 0.000 abstract 1
- 239000002356 single layer Substances 0.000 abstract 1
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 20
- 229910052786 argon Inorganic materials 0.000 description 10
- 239000002245 particle Substances 0.000 description 7
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 6
- 235000011941 Tilia x europaea Nutrition 0.000 description 6
- 239000004571 lime Substances 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000005864 Sulphur Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 208000037656 Respiratory Sounds Diseases 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000007664 blowing Methods 0.000 description 3
- 238000009749 continuous casting Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 238000009850 CAS-OB (composition adjustment by sealed argon bubbling with oxygen blowing) Methods 0.000 description 2
- 235000019739 Dicalciumphosphate Nutrition 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000001506 calcium phosphate Substances 0.000 description 2
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- NEFBYIFKOOEVPA-UHFFFAOYSA-K dicalcium phosphate Chemical compound [Ca+2].[Ca+2].[O-]P([O-])([O-])=O NEFBYIFKOOEVPA-UHFFFAOYSA-K 0.000 description 2
- 229940038472 dicalcium phosphate Drugs 0.000 description 2
- 229910000390 dicalcium phosphate Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 229960001866 silicon dioxide Drugs 0.000 description 2
- CADICXFYUNYKGD-UHFFFAOYSA-N sulfanylidenemanganese Chemical compound [Mn]=S CADICXFYUNYKGD-UHFFFAOYSA-N 0.000 description 2
- 101100537937 Caenorhabditis elegans arc-1 gene Proteins 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 description 1
- 229910000915 Free machining steel Inorganic materials 0.000 description 1
- 235000006679 Mentha X verticillata Nutrition 0.000 description 1
- 235000002899 Mentha suaveolens Nutrition 0.000 description 1
- 235000001636 Mentha x rotundifolia Nutrition 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 235000003599 food sweetener Nutrition 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009847 ladle furnace Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000002101 lytic effect Effects 0.000 description 1
- 238000010310 metallurgical process Methods 0.000 description 1
- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000003765 sweetening agent Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to an external refining method of various microalloy steel and special steel, in particular to a cored wire for external refining desulfurization and fine inclusion removal of molten steel and a preparation method thereof. The core of the core-spun yarn is prepared by respectively taking low-melting-point premelting slag powder, calcium fluoride, calcium carbonate or magnesium carbonate or a mixture of the calcium carbonate and the magnesium carbonate, calcium oxide or magnesium oxide or a mixture of the calcium oxide and the magnesium oxide and a binder according to a formula ratio, wherein the core powder takes a low-carbon steel belt of 2-5 mm as a sheath, and the core-spun yarn is prepared on a wire manufacturing machine in a single-layer steel lap joint mode. The invention has the advantages of scientific formula, simple and reasonable process, effective removal of inclusions in molten steel, realization of quick refining and desulfurization of molten steel until the sulfur content is lower than 0.0030 percent, high efficiency, stability and short time. Can meet the requirements of different molten steel on the sulfur content. Greatly improves the quality of the refined steel and reduces the smelting cost.
Description
Technical field
The present invention relates to the secondary refining method of various micro-alloyed steels and special steel, particularly a kind of cored-wire and method for making thereof that is used for outside-stove refining dephosphorization, removes fine foreign matter, it is various micro-alloyed steels or special steel refining desulfuration, remove the cored-wire of fine foreign matter first-selection.
Background technology
In general, except that indivedual steel grades such as free-cutting steel, sulphur is the harmful element in the steel, forms sulfide inclusion in steel, reduces the ductility and the toughness, particularly impelling strength of steel.When sulphur exists with the form of iron sulphide, can cause hot-shortly, simultaneously, the steel resistance to corrosion that sulfur-bearing is high reduces significantly, and is also unfavorable to the welding property of steel.Austenitic stainless steel sulphide stress corrosion crackle (SSCC) can occur through pitting attack, and its pitting attack source is just at non-metallic inclusion places such as manganese sulfide inclusions; It is to the maximum defective of oil pipeline harm that hydrogen is induced crackle (HIC), will produce the gap between the inclusion of manganese sulfide system and the steel, makes it to become the responsive source that hydrogen is induced crackle.
Inclusion is main relevant with the quantity and the size of inclusion to the harm of steel, and inclusion is carried out quality control, and primary is the quantity and the size of control inclusion.Because steel grade is different and the smelting cost restriction, the requirement of inclusion also is not quite similar, to ordinary steel, always oxygen 50ppm, inclusion size do not constitute serious quality problems to steel performance usually below 50 μ m.Yet to IF steel, silicon steel, cord steel and pipe line steel etc., this index may not reach requirement at all, and for example, the steel cord requires Al
2O
3Be mingled with less than 10～15 μ m, could satisfy the requirement that 20 myriametres in the drawing process do not have broken end.
A lot of desulphurization technological process are arranged at present, and the agent of winding-up lime desulfurization is a kind of comparatively common sulfur method in molten steel.When adopting lime to carry out the processing of desulfurization usually as sweetening agent, 2CaO+2S=2CaS+O
2, the oxygen of reaction generation combines with the silicon in the molten steel, produces silicon-dioxide (SiO
2).Along with being blown into lime, this silicon-dioxide has formed Dicalcium Phosphate (Feed Grade), and Dicalcium Phosphate (Feed Grade) formation solid layer is wrapped in lime powder surface.The result is unfavorable for the sweetening effectiveness of lime powder.Therefore the effective rate of utilization that improves the lime powder becomes the key that improves desulfuration efficiency.
In addition, the key of raising product made from steel quality, production Clean Steel is to control inclusion.Inclusion major part in the molten steel is by the buoyancy removal of floating naturally, we can say that this situation carrying out in whole metallurgical process always.But steel-making is large scale continuous prod, only depends on nature come-up efficient very low, can't satisfy production requirement, therefore usually adopts special means, and the removal of inclusion is strengthened in for example external refining, filtration etc.It is one of important refining means of ladle furnace that Argon stirs, and BOTTOM ARGON BLOWING is the composition and the temperature of molten steel evenly, and most important function is the removal that promotes inclusion in the molten steel.Though aforesaid method can be removed inclusion to a certain extent, but can not effectively control fine foreign matter.
Summary of the invention
The present invention be directed to above-mentioned problems of the prior art provides a kind of energy stable size and distributed number and the strong cored-wire of sweetening power of controlling inclusion in the molten steel, effect obviously, stablize, guarantee and improve the quality of refining steel, reduce smelting cost, and preparation technology is simple, is beneficial to use, operation, transportation and storage.
In order to solve the problems of the technologies described above, the present invention is achieved in that the cored-wire that is used for outside-stove refining dephosphorization, removes fine foreign matter, the core of its cored-wire by following raw materials by weight through being prepared from:
Mixture 1～60%, calcium oxide, magnesium oxide or the calcium oxide of low melting point pre-melted slag pulvis 1～70%, lime carbonate, magnesiumcarbonate or lime carbonate and magnesiumcarbonate and magnesian mixture 10～98%, Calcium Fluoride (Fluorspan) 0～40%, binding agent 0～20%.
The core of described cored-wire by following raw materials by weight through being prepared from:
Mixture 2～55%, calcium oxide, magnesium oxide or the calcium oxide of low melting point pre-melted slag pulvis 5～65%, lime carbonate, magnesiumcarbonate or lime carbonate and magnesiumcarbonate and magnesian mixture 15～85%, Calcium Fluoride (Fluorspan) 2～35%, binding agent 0～20%.
The core of described cored-wire by following raw materials by weight through being prepared from:
Mixture 10～45%, calcium oxide, magnesium oxide or the calcium oxide of low melting point pre-melted slag pulvis 10～35%, lime carbonate, magnesiumcarbonate or lime carbonate and magnesiumcarbonate and magnesian mixture 30～70%, Calcium Fluoride (Fluorspan) 5～30%, binding agent 5～15%.
Described binding agent is any one or a two or more mixture in clay, Portland cement, wilkinite, the water glass.
The granularity of described raw material is at 1mm～3.5mm, wherein calcium oxide, magnesian activity 〉=200ml.
Described low melting point pre-melted slag pulvis by following raw materials by weight through being prepared from:
CaO 10%～70%, Al
2O
315%～50%, SiO
20～10%, MgO 0～10%, CaF
20～30%, its fusing point is at 1100 ℃～1550 ℃.
Prepare the processing method of described cored-wire, may further comprise the steps:
A, feed intake, batch mixing
By formulation ratio respectively its granularity be the low melting point fritting ground-slag of 1nm～3.5mm; Calcium Fluoride (Fluorspan); The mixture of lime carbonate, magnesiumcarbonate or lime carbonate and magnesiumcarbonate; Calcium oxide, magnesium oxide or calcium oxide and magnesian mixture and tackiness agent go into to carry out batch mixing, mixing time 1h～8h in the blender;
B, oven dry are handled
Dry in 80 ℃～200 ℃ drying plants, the time is 2h～24h, is the core powder of cored-wire.
C, system cored-wire
Above-mentioned core powder after drying is handled is a crust with the mild-carbon steel strip of 2～5mm, adopts individual layer steel lapping type to make cored-wire on twine machine, and envelope curve speed is 8～30m/min, and core powder content is at 100～240g/m.
Cored-wire of the present invention is in the refining production process of various micro-alloyed steels and special steel, the hope of desulfurization simultaneously and removal fine foreign matter is become a reality, and can stablize the amount of size and the distribution of sulphur and inclusion in the control molten steel, and obtain the ideal effect by feeding in LF, RH, VD, CAS-OB tundish or crystallizer.
The present invention adopts the original position generation agent of the mixture superfine powder of lime carbonate, magnesiumcarbonate or lime carbonate and magnesiumcarbonate as micro-bubble, and the decomposition course of lime carbonate, magnesiumcarbonate is as follows:
When lime carbonate, when the magnesiumcarbonate powder is enough tiny, produce the size of bubble and the sizableness of powder.Therefore can in molten steel, introduce ultra-fine bubble (size of bubble is between 10～300 μ m).The size of bubble is tiny more, and the removal efficient of inclusion is high more.In addition, another product magnesium oxide or calcium oxide size after the cored-wire decomposition reaction of the present invention of calcium oxide, magnesium oxide or the calcium oxide that adds and the mixture of magnesian mixture+low melting point pre-melted slag+Calcium Fluoride (Fluorspan)+lime carbonate, magnesiumcarbonate or lime carbonate and magnesiumcarbonate are tiny, can melt rapidly in molten steel that the formation slag drips and with molten steel in Al
2O
3Inclusion forms the low melting point calcium-aluminate, is easy to float in the ladle slag, thereby reduces the Al that refining produces
2O
3The quantity of inclusion and size.
Cored-wire of the present invention compared with prior art, because scientific formulation rationally produces micro-bubble when it adds in the molten steel, collision probability height with inclusion, tiny slag drips and has the wash heat function simultaneously, also can effectively remove the inclusion in the molten steel, and through using proof, the size and the quantity of cored-wire may command nonmetallic inclusionsin steel of the present invention, total oxygen in the steel can be controlled to 3～15ppm, the equivalent diameter of inclusion is 0.5～9 μ m, and the inclusion average area is 0.002～0.008%; Simultaneously, the sweetening power of cored-wire of the present invention is strong, and desulfurization degree is 60%～90%, can realize the liquid steel refining desulfurization, and the content of sulphur is lower than 0.0010% behind the molten steel desulfurizing.Preparation technology is simple, convenient, and the purity that obviously improves molten steel reduces smelting cost.
Embodiment originally
Below in conjunction with specific embodiment the present invention is further elaborated, but protection scope of the present invention is not limited by specific embodiment, is as the criterion with claims.In addition, with under the prerequisite of technical solution of the present invention, any change or change that those of ordinary skills that the present invention did are realized easily all will fall within the claim scope of the present invention.
Embodiment 1
The at first preparation of low melting point pre-melted slag,
The low melting point pre-melted slag is got CaO powder 40kg, Al by formulation ratio
2O
3Powder 35kg, SiO
2Powder 10kg, MgO powder 10kg, CaF
2Powder 5kg puts into blender and carries out even batch mixing, fusing in the magnesia crucible, cooling then, and broken then roll and the air-flow micronizer grinds the powder that preparation becomes 1nm～3.5mm, its fusing point is standby at 1100～1550 ℃; Getting its particle diameter respectively by formulation ratio again is that low melting point fritting ground-slag 35kg, calcium fluoride powder 5kg, calcium oxide powder 55kg, the Paris white 5kg of 1nm～3.5mm goes into to carry out even batch mixing 1～8h in the vertical blender, wherein said calcium oxide, magnesian activity 〉=200ml; The powder for preparing is gone into 80～200 ℃ of drying plants dries 10～22h and is pulvis.With thickness is the crust of the common low carbon steel band of 2mm～5mm as cored-wire, core for through the above-mentioned pulvis of oven dry on twine machine, adopt individual layer steel band lapping type system cored-wire, envelope curve speed is 8～30m/min, cored-wire pulvis content is at 100～240g/m, the cored-wire closed at both ends is dressed up 1000～2000m/ volume, is beneficial to control add-on and adding speed in the use, the cross section of cored-wire is circular, packing will be guaranteed good seal, prevents humidity, and uses in 20 days.
Embodiment 2
Get CaO10kg, Al by formulation ratio
2O
350kg, SiO
25kg, MgO 5kg, CaF
230kg prepares the low melting point pre-melted slag, and its method is with embodiment 1; Getting its particle diameter respectively by formulation ratio again is that low melting point pre-melted slag 1kg, the magnesium oxide 98kg, the magnesiumcarbonate 1kg that prepare of 1nm～3.5mm goes into to carry out even batch mixing 1～8h in the vertical blender, wherein said calcium oxide, magnesian activity 〉=200ml; The powder for preparing is gone into 100～150 ℃ of drying plants dries 10h～22h and is pulvis, with thickness is the crust of the mild-carbon steel strip of 2mm as cored-wire, core for through the above-mentioned pulvis of oven dry on twine machine, adopt individual layer steel band lapping type system cored-wire, other is with embodiment 1.
Embodiment 3
Get CaO70kg, Al by formulation ratio
2O
315kg, SiO
23kg, MgO 2kg, CaF
210kg prepares the low melting point pre-melted slag, and its method is with embodiment 1; Getting its particle diameter respectively by formulation ratio again is that mixture 30kg (both proportionings are not strict with), calcium oxide and magnesian mixture 10kg, the wilkinite 15kg of the low melting point pre-melted slag 45kg, lime carbonate and the magnesiumcarbonate that prepare of 1nm～3.5mm goes into to carry out even batch mixing 1～8h in the vertical blender, wherein said calcium oxide, magnesian activity 〉=200ml; The powder for preparing is gone into 70～180 ℃ of drying plants dries 10h～20h and is pulvis, with thickness is the crust of the mild-carbon steel strip of 2.5mm as cored-wire, core for through the above-mentioned pulvis of oven dry on twine machine, adopt individual layer steel band lapping type system cored-wire, other is with embodiment 1.
Embodiment 4
Get CaO50kg, Al by formulation ratio
2O
340kg, SiO
25kg, MgO 5kg prepare the low melting point pre-melted slag, and its method is with embodiment 1; Getting its particle diameter respectively by formulation ratio again is that low melting point pre-melted slag 60kg, the Calcium Fluoride (Fluorspan) 10kg, lime carbonate 1kg, magnesium oxide 25kg, the clay 4kg that prepare of 1nm～3.5mm goes into to carry out even batch mixing 1～8h in the vertical blender, wherein said calcium oxide, magnesian activity 〉=200ml; The powder for preparing is gone into 90～160 ℃ of drying plants dries 10h～15h and is pulvis, with thickness is the crust of the mild-carbon steel strip of 5mm as cored-wire, core is to pass through the above-mentioned pulvis of oven dry on twine machine, adopt individual layer steel band lapping type system cored-wire, cross section is square, and other is with embodiment 1.
Embodiment 5
Get CaO55kg, Al by formulation ratio
2O
325kg, CaF
220kg prepares the low melting point pre-melted slag, and its method is with embodiment 1; Getting its particle diameter respectively by formulation ratio again is that low melting point pre-melted slag 3kg, the Calcium Fluoride (Fluorspan) 2kg, lime carbonate 10kg, the magnesium oxide 85kg that prepare of 1nm～3.5mm goes into to carry out even batch mixing 1～8h in the vertical blender, wherein said calcium oxide, magnesian activity 〉=200ml; The powder for preparing is gone into 80～180 ℃ of drying plants dries 10h～16h and is pulvis, with thickness is the crust of the mild-carbon steel strip of 4mm as cored-wire, core for through the above-mentioned pulvis of oven dry on twine machine, adopt individual layer steel band lapping type system cored-wire, other is with embodiment 1.
Embodiment 6
Get CaO35kg, Al by formulation ratio
2O
345kg, MgO5kg, CaF
215kg prepares the low melting point pre-melted slag, and its method is with embodiment 1; Getting its particle diameter respectively by formulation ratio again is that low melting point pre-melted slag 12kg, the Calcium Fluoride (Fluorspan) 18kg, magnesiumcarbonate 45kg, calcium oxide 15kg, clay 6kg, the water glass 4kg that prepare of 1nm～3.5mm goes into to carry out even batch mixing 1～8h in the vertical blender, wherein said calcium oxide, magnesian activity 〉=200ml; The powder for preparing is gone into 90～170 ℃ of drying plants dries 10h～20h and is pulvis, with thickness is the crust of the mild-carbon steel strip of 3mm as cored-wire, core is to pass through the above-mentioned pulvis of oven dry on twine machine, adopt individual layer steel band lapping type system cored-wire, cross section is square, and other is with embodiment 1.
Embodiment 7
Get CaO20kg, Al by formulation ratio
2O
330kg, SiO
210kg, MgO 10kg, CaF
230kg prepares the low melting point pre-melted slag, and its method is with embodiment 1; Getting its particle diameter respectively by formulation ratio again is that low melting point pre-melted slag 12kg, the Calcium Fluoride (Fluorspan) 18kg, magnesiumcarbonate 45kg, calcium oxide 15kg, Portland cement 6kg, the water glass 4kg that prepare of 1nm～3.5mm goes into to carry out even batch mixing 1～8h in the vertical blender, wherein said calcium oxide, magnesian activity 〉=200ml; The powder for preparing is gone into 100～150 ℃ of drying plants dries 10～17h and is pulvis, with thickness is the crust of the mild-carbon steel strip of 3.5mm as cored-wire, core for through the above-mentioned pulvis of oven dry on twine machine, adopt individual layer steel band lapping type system cored-wire, other is with embodiment 1.
Be that cored-wire of the present invention is in the outside-stove refining dephosphorization of various micro-alloyed steels and special steel, the application in the removal fine foreign matter below.
Application Example 1
Ladle is transported to the LF station, and composition is regulated in the thermometric sampling.After the alloying refining finishes, stop Argon, feed cored-wire.Wire-feeding velocity is 200～300m/min, and the line feeding amount is 10～600m/t.Static 1～5min after the line feeding, Argon is gently handled then, and Argon pressure is between 0.13～0.8MPa, and argon flow amount is 50～120Nl/min.The light treatment time of Argon is 3min, and continuous casting adopts the whole process protection cast.After cored-wire adds molten steel because lime carbonate, magnesiumcarbonate powder are enough tiny, thereby produce the tiny bubble of disperse, bubble is more little, the removal efficient of inclusion is high more, it is tiny more that meanwhile cored-wire decomposes the granularity of another its lytic activity calcium oxide, just can in molten steel, melt the formation slag more rapidly and drip, and with molten steel in Al
2O
3Inclusion forms the low melting point calcium-aluminate, is easy to float in the ladle slag, has the wash heat function.
Under 500 power microscopes, analyze inclusion pattern and granularity along the sampling of strand inner arc 1/4 place, and (analyzing area is 10 * 10mm), adopts nitrogen oxygen instrument to analyze total oxygen content, and analytical results is as shown in table 1 to adopt quantitative metallographic analysis inclusion area content.1
The test-results of table 1 embodiment and Comparative Examples
| Embodiment | Total oxygen ppm | Maximum inclusion size μ m | Inclusion area average content % |
| The LF line feeding | 14 | 8.34 | 0.00803 |
| The contrast sample | 26 | 39.7 | 0.01239 |
Application Example 2
After molten steel was transported to the CAS-OB station, composition was regulated in the thermometric sampling, and pending molten steel is carried out deoxidation treatment.Work as α
[O]Began to feed cored-wire at≤0.0003% o'clock.Wire-feeding velocity is at 180～350m/min, and the line feeding amount is 10～600m/t.Argon bottom-blowing stirs after the line feeding, and the argon gas stirring intensity is 0～0.004m
3/ (mint), argon blowing time is at 5min, and continuous casting adopts the whole process protection cast.Adopt chemico-analytic method to measure the S content analysis and the results are shown in Table 2.
Table 2
| Main component | S |
| Before the desulfurization | 0.0070％ |
| After the desulfurization | 0.0012％ |
| Continuous casting steel billet | 0.0012％ |
Claims (7)
1, be used for outside-stove refining dephosphorization, remove the cored-wire of fine foreign matter, the core that it is characterized in that cored-wire by following raw materials by weight through being prepared from:
Low melting point pre-melted slag pulvis 1～70%
The mixture 1～60% of lime carbonate, magnesiumcarbonate or lime carbonate and magnesiumcarbonate
Calcium oxide, magnesium oxide or calcium oxide and magnesian mixture 10～98%
Calcium Fluoride (Fluorspan) 0～40%
Binding agent 0～20%.
2, cored-wire according to claim 1, the core that it is characterized in that described cored-wire by following raw materials by weight through being prepared from:
Low melting point pre-melted slag pulvis 5～65%
The mixture 2～55% of lime carbonate, magnesiumcarbonate or lime carbonate and magnesiumcarbonate
Calcium oxide, magnesium oxide or calcium oxide and magnesian mixture 15～85%
Calcium Fluoride (Fluorspan) 2～35%
Binding agent 0～20%.
3, cored-wire according to claim 1, the core that it is characterized in that described cored-wire by following raw materials by weight through being prepared from:
Low melting point pre-melted slag pulvis 10～35%
The mixture 10～45% of lime carbonate, magnesiumcarbonate or lime carbonate and magnesiumcarbonate
Calcium oxide, magnesium oxide or calcium oxide and magnesian mixture 30～70%
Calcium Fluoride (Fluorspan) 5～30%
Binding agent 5～15%.
4,, it is characterized in that described binding agent is any one or a two or more mixture in clay, Portland cement, wilkinite, the water glass according to claim 1,2 or 3 described cored-wires.
5, according to claim 1,2 or 3 described cored-wires, the granularity that it is characterized in that described raw material is at 1nm～3.5mm, wherein calcium oxide, magnesian activity 〉=200ml.
6, according to claim 1,2 or 3 described cored-wires, it is characterized in that described low melting point pre-melted slag pulvis by following raw materials by weight through being prepared from:
CaO 10%～70%, Al
2O
315%～50%, SiO
20～10%, MgO 0～10%, CaF
20～30%, its fusing point is at 1100 ℃～1550 ℃.
7, the processing method of the described cored-wire of preparation claim 1 is characterized in that may further comprise the steps:
A, feed intake, batch mixing
Get the low melting point pre-melted slag that its granularity is 1nm～3.5mm by formulation ratio; Calcium Fluoride (Fluorspan); The mixture of lime carbonate, magnesiumcarbonate or lime carbonate and magnesiumcarbonate; Calcium oxide, magnesium oxide or calcium oxide and magnesian mixture and tackiness agent go into to carry out batch mixing, mixing time 1h～8h in the mixing equipment;
B, oven dry are handled
Dry in 80 ℃～200 ℃ drying plants, the time is 2h～24h, is the core powder of cored-wire.
C, system cored-wire
Above-mentioned core powder after drying is handled is a crust with the mild-carbon steel strip of 2～5mm, adopts individual layer steel lapping type to make cored-wire on twine machine, and envelope curve speed is 8～30m/min, and core powder content is at 100～240g/m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100123805A CN101319266A (en) | 2008-07-17 | 2008-07-17 | Core-spun yarn for external refining desulfurization and removing fine foreign matter and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100123805A CN101319266A (en) | 2008-07-17 | 2008-07-17 | Core-spun yarn for external refining desulfurization and removing fine foreign matter and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101319266A true CN101319266A (en) | 2008-12-10 |
Family
ID=40179539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100123805A Pending CN101319266A (en) | 2008-07-17 | 2008-07-17 | Core-spun yarn for external refining desulfurization and removing fine foreign matter and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101319266A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102344989A (en) * | 2010-08-06 | 2012-02-08 | 营口亚泰化工有限公司 | Pretreatment method of molten iron for desulfurization by wire feeding method |
| CN114774794A (en) * | 2022-05-07 | 2022-07-22 | 张家港荣盛特钢有限公司 | Cord steel and method for modifying inclusion of cord steel |
-
2008
- 2008-07-17 CN CNA2008100123805A patent/CN101319266A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102344989A (en) * | 2010-08-06 | 2012-02-08 | 营口亚泰化工有限公司 | Pretreatment method of molten iron for desulfurization by wire feeding method |
| CN102344989B (en) * | 2010-08-06 | 2013-05-29 | 辽宁亚泰新型建材科技有限公司 | Pretreatment method of molten iron for desulfurization by wire feeding method |
| CN114774794A (en) * | 2022-05-07 | 2022-07-22 | 张家港荣盛特钢有限公司 | Cord steel and method for modifying inclusion of cord steel |
| CN114774794B (en) * | 2022-05-07 | 2023-03-28 | 张家港荣盛特钢有限公司 | Cord steel and method for modifying inclusion of cord steel |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101784680B (en) | Process for manufacturing steel for steel pipes excellent in sulfur resistance | |
| CN109252008A (en) | A kind of production method of low carbon, low nitrogen ultralow-sulfur steel | |
| CN101319265A (en) | Powder additive for external refining desulfurization and removing fine foreign matter and its preparation method | |
| CN101492758B (en) | Method for controlling non-metallic inclusion in pipeline steel | |
| CN105695664B (en) | A kind of low cost pneumatic steelmaking deoxidization technique | |
| CN110177889A (en) | The desulfuration processing method and desulfurizing agent of molten steel | |
| CN102586547B (en) | Production method of low-cost clean steel | |
| CN102337378A (en) | Process for removing non-metallic inclusions in molten steel | |
| CN108531807A (en) | A kind of heavy wall heavy caliber X80M pipelines clean steel and smelting process | |
| CN100543153C (en) | Composite ball for external refining desulfurization and removing fine foreign matter and its making method | |
| CN101096720B (en) | Desulfurization method and desulfurizer for ultra-low carbon steel external refining deep desulfurization | |
| CN100582249C (en) | Process method for removing fine inclusions by external refining | |
| CN101319268B (en) | External refining desulfurization process method | |
| CN101660022B (en) | Method for improving steel cleanness of stainless steel | |
| CN100543152C (en) | Process for removing fine inclusion in molten steel | |
| CN101348847B (en) | Process method for refining and desulfurizing outside furnace | |
| CN100532584C (en) | MgO base desulfurizing agent and producing method thereof | |
| CN101319266A (en) | Core-spun yarn for external refining desulfurization and removing fine foreign matter and preparation method thereof | |
| CN101319269B (en) | Process method for refining process desulfurization | |
| CN101503747B (en) | Heating steel slag washing material for converter steel melting, preparation and use method | |
| CN104294008B (en) | Iron melt desulfurizing agent and application | |
| CN104694688B (en) | The compound desulfurization slag slag state regulator of magnesium and the compound desulfurization Slag modification method of magnesium | |
| CN100507021C (en) | LF composite deoxidization reducer | |
| CN101323895B (en) | Process for removing fine inclusion in molten steel | |
| CN108754058A (en) | A kind of nano-hot metal composite desulfurizing agent and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Open date: 20081210 |